The Secretary may designate, subject to the Secretary’s salary-setting authority, those bona fide administrative, executive, and professional employees who may not receive payment for overtime work, but who may be granted compensatory time for overtime work. On or after July 1, 1989, an employee who is included in the Executive Pay Plan at a pay grade of (ES) 6 or above is not entitled to accrue any compensatory time other than as provided in § 9-205(a)(3) of this article for holiday work. A law enforcement employee of the Department of State Police holding a commissioned rank or a law enforcement employee of the Natural Resources Police holding a rank above sergeant may not receive payment for any overtime work, but may be granted compensatory time for overtime work.